410 ONUPHIS CONCHYLEGA. 



3. Onuphis conohylega, Sars, 1835. Plate LXIII, fig. 9 in tube; Plate LXIV, figs. 1, 1 a 

 —teeth; Plate LXXV, fig. 7— foot; Plate LXXXIV, figs. 5-5 c— bristles. 



Specific Characters.— Head resembling that of Onuphis britannica, but differing in the 

 shorter and more rounded frontal tentacles with pigment behind them. The eyes are 

 somewhat less. Tentacles with ringed cirrophores (in spirit). The first segment is 

 narrow, and carries the tentacular cirri at its anterior border. The proboscis agrees in 

 colour with that of Onuphis britannica, the T-shaped dark bands being conspicuous at the 

 posterior appendages, as well as a dark patch at the posterior end of each great dental 

 plate. An incurvation of the inner edge of each maxilla occurs, connected by the 

 dark mass of pigment with the great dental plate. Right great dental plate has 

 nine teeth ; the left eight ; the azygos plate has nine or ten teeth. The left anterior 

 curved plate has nine or ten teeth ; the right has twelve. The usual dark brown 

 base occurs at each of the latter. A single isolated denticle lies outside each. The 

 mandibles have an oblique anterior edge with a single denticle, and long tapering 

 shafts. First pair of feet somewhat shorter than in Onuphis britannica, and the terminal 

 flap is nearly circular, the dorsal cirrus is subulate, the posterior papilla nearly cylindrical, 

 and the ventral cirrus (on each side of the mouth) has a slight constriction in the middle. 

 The stout falcate bristles are strongly hooked at the tip, and beneath is a small secondary 

 process or riclge. The tenth foot has a long subulate dorsal cirrus, a minute button-like 

 anterior papilla, and a long posterior papilla at the tip. The ventral cirrus forms a boss. 

 Dorsally are stout simple bristles, with the tip bent at an angle, and winged as well as 

 finely tapered. A single bifid hook beneath. The branchiae in some begin on the eleventh, 

 though generally on the twelfth foot, and each continues as a simple filament almost to 

 the tip of the tail. Marenzeller 1 describes in the examples from Spitzbergen two or more 

 divisions, but they never exceed four, the northern forms thus differing from the southern 

 in this respect. 



Synonyms. 



1835. Onuphis conchylega, Sars. Beskr. og Iaktt., p. 61, Tab. x, f. 28a — e. 



,, Diopatra Eschrichti, Grube. Fam. Annel., pp. 43 and 123. 

 1843. Onuphis Eschrichtii, CErsted. Gronl. Annul. Dors., p. 20, Tab. iii, f. 33—41, 45. 

 1851. ,, conchylega, Sars. Nyt Mag. f. Naturvid., vi, p. 209. 



„ „ „ Grrube. Fam. Annel., pp. 44 and 123. 



1853. „ „ Sars. Nyt Mag. f. Naturvid., vii, pp. 386 and 391. 



„ „ Eschrichtii, Stimpson. Invert. Gr. Manan, p. 33. 



1857. „ „ Danielssen. Reise, p. 59. 



1858. „ „ idem. Ibid., p. 116. 



1859. „ conchylega, Sars. Ibid., p. 14 (sep. copy). 



1860. „ „ Packard. Canad. Nat. and Greol., vol. vii, p. 403. 



1863. „ conchilega, Stimpson. Ann. Greenl. in Proc. Nat. Sc. Pliilad., p. 140. 

 1865. Diopatra Eschrichtii, De Quatrefages. Annel., i, p. 349. 

 „ Nothria conchylega, Johnston. Cat. Worms Brit. Mus., pp. 138 and 341. 



1 < Archiv f. Naturges./ lv, p. 129, 1889. 



